In his last will and testament, dated 1811, Philadelphia merchant William Poyntell left to his son-in-law ‘all my stained glass which I brought from Europe excepting only two pieces . . .’ Three of Poyntell’s glass panels, kept in the family for over 100 years and now in the Philadelphia Museum of Art, have been identified as part of the thirteenth-century glass removed in 1803 from the S…